Found in a Popular Electronics from the 90s, this circuit applies to flashes with xenon lamps. The transistor admits equivalent and the phototransistor is of the Darlington type.
In the diagram from the November 1999 Electronics Now magazine we have the way to improve both the...
This simple circuit was found in a 2001 documentation. With each touch of CH1, a 4017 output...
With the use of a microphone and an amplifier stage, this circuit does not require connection to...